Senior Software Engineer, Solutions Engineering

Who We Are At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people. We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you. We're united by shared goals and shared motivations at Justworks. These are best summed up in our company values, which are reflected in our product and in our team. Our Values If this sounds like you, you’ll fit right in. Who You Are You are a senior product engineer who enjoys solving hard problems where software, APIs, and real developer workflows meet. You can take a partner's desired customer experience, understand both sides of an integration, and deliver a practical, supportable solution with the capabilities that are available today. You bring strong API and web-platform fundamentals, communicate comfortably with external technical audiences, and care as much about the developer's path to success as the code itself. You are not satisfied with repeatedly solving the same problem by hand: you turn what you learn from partner work into better SDKs, documentation, tooling, and integration patterns. What You Will Work On • Independently lead technical discovery and solutioning for priority partner integrations, including partner API research, data mapping, authentication and authorization flows, architecture choices, implementation support, and launch readiness. • Build and maintain high-quality developer ecosystem capabilities: portal experiences, documentation tooling, SDKs, sample apps, quickstarts, integration templates, and developer-support automation. • Create reference implementations and reusable patterns for common integration needs such as OAuth, webhooks, retries, idempotency, error handling, and observability. • Run technical working sessions with partners, translate complex requirements into clear decisions and action plans, and communicate platform boundaries accurately. • Work closely with Public API Engineering and Product to identify developer friction, validate proposed API designs with realistic use cases, and deliver concise, evidence-backed feedback. • Own a multi-surface developer journey or a portfolio of partner integrations from design through delivery, operational readiness, and iteration. • Improve developer self-service by using support questions, integration telemetry, and qualitative feedback to prioritize what should become documentation, an SDK feature, a product enhancement, or a platform request. • Review designs and code; mentor teammates; and elevate engineering quality in both internal systems and partner-facing artifacts. • Collaborate with Security, Support, and other stakeholders to ensure integrations are safe, observable, and supportable. How You Will Do Your Work As a Senior Software Engineer, how results are achieved is central to success at Justworks. You will demonstrate: • Good judgment: You balance partner urgency with long-term maintainability, security, and operational quality. • Resourcefulness: You find a clear route through ambiguity, prototype thoughtfully, and reduce recurring work through reusable solutions. • Teamwork and communication: You build credibility in partner conversations and create durable written artifacts that help others move independently. • Influence and leadership: You lead through technical depth, clear recommendations, me